import { VantComponent } from '../common/component'
import { isImageFile, chooseFile, isVideoFile } from './utils'
import { imageProps, videoProps, mediaProps, messageFileProps } from './shared'
import { isBoolean, isPromise } from '../common/validator'
VantComponent({
  props: Object.assign(
    Object.assign(
      Object.assign(
        Object.assign(
          {
            disabled: Boolean,
            multiple: Boolean,
            uploadText: String,
            useBeforeRead: Boolean,
            afterRead: null,
            beforeRead: null,
            previewSize: {
              type: null,
              value: 80,
            },
            name: {
              type: null,
              value: '',
            },
            accept: {
              type: String,
              value: 'image',
            },
            fileList: {
              type: Array,
              value: [],
              observer: 'formatFileList',
            },
            maxSize: {
              type: Number,
              value: Number.MAX_VALUE,
            },
            maxCount: {
              type: Number,
              value: 100,
            },
            deletable: {
              type: Boolean,
              value: true,
            },
            showUpload: {
              type: Boolean,
              value: true,
            },
            previewImage: {
              type: Boolean,
              value: true,
            },
            previewFullImage: {
              type: Boolean,
              value: true,
            },
            videoFit: {
              type: String,
              value: 'contain',
            },
            imageFit: {
              type: String,
              value: 'scaleToFill',
            },
            uploadIcon: {
              type: String,
              value: 'photograph',
            },
          },
          imageProps,
        ),
        videoProps,
      ),
      mediaProps,
    ),
    messageFileProps,
  ),
  data: {
    lists: [],
    isInCount: true,
  },
  methods: {
    formatFileList() {
      const { fileList = [], maxCount } = this.data
      const lists = fileList.map((item) =>
        Object.assign(Object.assign({}, item), {
          isImage: isImageFile(item),
          isVideo: isVideoFile(item),
          deletable: isBoolean(item.deletable) ? item.deletable : true,
        }),
      )
      this.setData({ lists, isInCount: lists.length < maxCount })
    },
    getDetail(index) {
      return {
        name: this.data.name,
        index: index == null ? this.data.fileList.length : index,
      }
    },
    startUpload() {
      const { maxCount, multiple, lists, disabled } = this.data
      if (disabled) return
      chooseFile(Object.assign(Object.assign({}, this.data), { maxCount: maxCount - lists.length }))
        .then((res) => {
          this.onBeforeRead(multiple ? res : res[0])
        })
        .catch((error) => {
          this.$emit('error', error)
        })
    },
    onBeforeRead(file) {
      const { beforeRead, useBeforeRead } = this.data
      let res = true
      if (typeof beforeRead === 'function') {
        res = beforeRead(file, this.getDetail())
      }
      if (useBeforeRead) {
        res = new Promise((resolve, reject) => {
          this.$emit(
            'before-read',
            Object.assign(Object.assign({ file }, this.getDetail()), {
              callback: (ok) => {
                ok ? resolve() : reject()
              },
            }),
          )
        })
      }
      if (!res) {
        return
      }
      if (isPromise(res)) {
        res.then((data) => this.onAfterRead(data || file))
      } else {
        this.onAfterRead(file)
      }
    },
    onAfterRead(file) {
      const { maxSize, afterRead } = this.data
      const oversize = Array.isArray(file)
        ? file.some((item) => item.size > maxSize)
        : file.size > maxSize
      if (oversize) {
        this.$emit('oversize', Object.assign({ file }, this.getDetail()))
        return
      }
      if (typeof afterRead === 'function') {
        afterRead(file, this.getDetail())
      }
      this.$emit('after-read', Object.assign({ file }, this.getDetail()))
    },
    deleteItem(event) {
      const { index } = event.currentTarget.dataset
      this.$emit(
        'delete',
        Object.assign(Object.assign({}, this.getDetail(index)), {
          file: this.data.fileList[index],
        }),
      )
    },
    onPreviewImage(event) {
      if (!this.data.previewFullImage) return
      const { index } = event.currentTarget.dataset
      const { lists, showmenu } = this.data
      const item = lists[index]
      wx.previewImage({
        urls: lists.filter((item) => isImageFile(item)).map((item) => item.url),
        current: item.url,
        showmenu,
        fail() {
          wx.showToast({ title: '预览图片失败', icon: 'none' })
        },
      })
    },
    onPreviewVideo(event) {
      if (!this.data.previewFullImage) return
      const { index } = event.currentTarget.dataset
      const { lists } = this.data
      const sources = []
      const current = lists.reduce((sum, cur, curIndex) => {
        if (!isVideoFile(cur)) {
          return sum
        }
        sources.push(Object.assign(Object.assign({}, cur), { type: 'video' }))
        if (curIndex < index) {
          sum++
        }
        return sum
      }, 0)
      wx.previewMedia({
        sources,
        current,
        fail() {
          wx.showToast({ title: '预览视频失败', icon: 'none' })
        },
      })
    },
    onPreviewFile(event) {
      const { index } = event.currentTarget.dataset
      wx.openDocument({
        filePath: this.data.lists[index].url,
        showMenu: true,
      })
    },
    onClickPreview(event) {
      const { index } = event.currentTarget.dataset
      const item = this.data.lists[index]
      this.$emit('click-preview', Object.assign(Object.assign({}, item), this.getDetail(index)))
    },
  },
})
